Immutable object: Difference between revisions

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{{short description|Object whose state cannot be modified after it is created}}

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In [[object-oriented computer programming|object-oriented]] and [[Functional programming|functional]] programming, an '''immutable object''' (unchangeable<ref>{{cite web|url=http://www.oxfordlearnersdictionaries.com/definition/english/immutable|title=immutable adjective - Definition, pictures, pronunciation and usage notes - Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com|website=www.oxfordlearnersdictionaries.com}}</ref> object) is an [[object (computer science)|object]] whose state cannot be modified after it is created.<ref name=Goetz>Goetz et al. ''Java Concurrency in Practice''. Addison Wesley Professional, 2006, Section 3.4. Immutability</ref> This is in contrast to a '''mutable object''' (changeable object), which can be modified after it is created. <ref>{{cite web|url=https://web.mit.edu/6.005/www/fa16/classes/09-immutability/|title=6.005 — Software Construction}}</ref> In some cases, an object is considered immutable even if some internally used attributes change, but the object's state appears unchanging from an external point of view. For example, an object that uses <!--